feat: working data download and indexing

src/lib/fetch.mjs

@@ -0,0 +1,13 @@
+import axios from 'axios';
+
+const api = 'https://opensky-network.org/api';
+
+export default axios.create({
+  baseURL: api,
+  timeout: 3000,
+  responseType: 'json',
+  headers: {
+    'X-Custom-Header': 'foobar',
+    'Content-Type': 'application/json; charset=utf-8',
+  },
+});